Damage Analysis of Composite CFRP Tubes Using Acoustic Emission Monitoring and Pattern Recognition Approach

Šofer, Michal; Cienciala, Jakub; Fusek, Martin; Pavlíček, Pavel; Moravec, Richard A.

doi:10.3390/ma14040786

Cited by 41 publications

(33 citation statements)

References 27 publications

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“…[ 34,48 ] In combination with FFT analysis, it is possible to assign the matrix cracking to class D (47 kHz), debonding to class C (135–150 kHz), delamination to class B (250 kHz) and failure associated with fibers (375 kHz fiber fracture, 435 kHz fiber pull‐out) to class A. The results are consistent with typical frequencies for CFRP laminates [ 33,37,45,77 ] as well with assigned clusters for different failures. [ 34,67 ] Since both laminates are made of same type of material, the resulting frequencies for each damage mechanisms are the same.…”

Section: Resultssupporting

confidence: 69%

The effect of long‐time moisture exposure and low temperatures on mechanical behavior of open‐hole Cfrp laminate

et al. 2021

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Carbon fiber composite laminates (CFRP) used in aerospace are operating under various environmental conditions. Parts are often exposed to moisture which slowly diffuses into the laminate and forms internal stresses. During the flight, the aircraft is also exposed to low or elevated temperatures. The result is negative impact on composite performance due to formation of hygrothermal stresses. Understanding this phenomenon helps with prediction of the damage development which is vital for increasing the components service life. The open‐hole CFRP laminates were conditioned in humid air at 70°C/85% RH for 33,800 h and the effect of low temperatures on quasi‐cyclic tension properties and fracture behavior was investigated. The mechanical tests on two types of CFRP laminate with different number and orientation of plies were performed under − 55°C. The material behavior during the testing was monitored by acoustic emission technique. The light optical microscopy and scanning electron microscopy were used for the identification of failure mechanisms. The study showed that the hygrothermal effect has significant impact on materials toughness reduction. The damage mechanisms and characteristic morphologic features are changing due to the matrix degradation and weakened fiber/matrix interface.

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Section: Resultssupporting

confidence: 69%

The effect of long‐time moisture exposure and low temperatures on mechanical behavior of open‐hole Cfrp laminate

et al. 2021

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“…There are several methods of detecting damaged areas in composite materials [ 14 , 15 ]. Unlike other methods, the acoustic emission (AE) [ 16 , 17 ] method is very sensitive in detecting active cracks [ 18 ], even in the beginning of plastic deformation [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

“…It can be used to characterize the delamination process and provides reliable information about the onset of delamination on a microscopic as well as on a macroscopic scale [ 24 , 25 ]. The article [ 14 ] presents the stretching of carbon fibre tubes, which shows the dependence of force on time by the activity of acoustic emission as a function of time, thanks to which it was possible to determine the boundary separating signals from a broken fibre from undesirable secondary sources. The use of the acoustic emission method helped to identify damage mechanisms, such as matrix cracking, fibre cracking, decohesion, and detachment.…”

Section: Introductionmentioning

confidence: 99%

“…The results obtained as a result of acoustic emission are influenced by the type of material tested, its shape, and the test performed. The article [ 14 ] presents the results for CFRP composite bars, focusing mainly on the amplitude values for a specific type of failure. The nature of the destruction of these materials, compared to GFRP, is similar.…”

Section: Introductionmentioning

confidence: 99%

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Determining the Stages of Deformation and Destruction of Composite Materials in a Static Tensile Test by Acoustic Emission

Panasiuk

Dudzik

2022

Materials

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Composite materials are used in many industries. They are construction materials that are being used more and more often, which makes it necessary to accurately identify the process of their destruction. Recent decades have resulted in an intensive increase in diagnostic tests of structures and mechanical elements. Non-destructive testing (NDT) represents a group of test methods (surface and volumetric) that provide information about the properties of the tested element without changing its structure. The method of acoustic emission (AE) is also being used more frequently. Thanks to the ability to detect and locate signal sources, as well as to perform tests during operation, it is a method that is increasingly used in industry. In this article, the acoustic emission was used to analyze the changes occurring in composite materials. Obtained parameters helped to determine the signals originating from fibre delamination, fibre cracking, etc., as well as the starting point of these changes and the stress values at which these changes occurred. The analysis of acoustic emission signals recorded during the tests helped to determine the values of amplitudes characteristic for the destruction mechanisms of considered composite materials. Signals with an amplitude in the range of 30–41 dB may indicate elastic–plastic deformation of the matrix. Signals with an amplitude in the range of 42–50 dB indicate matrix cracks with the accompanying phenomenon of fibre delamination. Signals with amplitudes greater than 50 dB indicate fibre breakage. Based on the test results, the permissible stress was determined; when exceeded, the mechanisms of damage to the structure of composite materials accumulate. This stress limit for the tested material is 70 MPa. The use of the acoustic emission method in mechanical tests may contribute to a greater knowledge of composite materials used as a construction material, as well as determine the stresses allowable for a given structure.

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“…Last but not least, research of innovative materials and components goes hand in hand with the development of modern testing methods, advantageously non-destructive ones, some of which are also of interest to the presented Special Issue. Popular methods are those based on optical systems, such as the PhotoStress and digital image correlation (DIC) methods [19], or the acoustic emission method based on transferring acoustic signals through the tested material [20]. Neutron diffraction is also among the top-level nondestructive testing methods [21,22].…”

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confidence: 99%

Special Issue: Selected Papers from Experimental Stress Analysis 2020

2021

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Damage Analysis of Composite CFRP Tubes Using Acoustic Emission Monitoring and Pattern Recognition Approach

Cited by 41 publications

References 27 publications

The effect of long‐time moisture exposure and low temperatures on mechanical behavior of open‐hole Cfrp laminate

The effect of long‐time moisture exposure and low temperatures on mechanical behavior of open‐hole Cfrp laminate

Determining the Stages of Deformation and Destruction of Composite Materials in a Static Tensile Test by Acoustic Emission

Special Issue: Selected Papers from Experimental Stress Analysis 2020

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